"The past is always tense, the future perfect."
Diversity in thought leads to innovation in action.
In peace, sons bury their fathers. In war, fathers bury their sons.
【译文】 孔子说:“我十五岁立志于学习,三十岁有所建树,四十岁不困惑,五十理解自然规律,六十明辨是非,七十随心所欲,不违规。”